#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mpi.h>

// Function prototype for the Fortran subroutine
void psolve_gcr_main(double ep, double a_helm[19][1000][1000], double b_helm[1000][1000][1000], 
                    double cm_helm[1000][1000][1000][8], int iter_max, double pi[1000][1000][1000],
                    double d, int idep, int jdep, 
                    int ids, int ide, int jds, int jde, int kds, int kde, 
                    int ims, int ime, int jms, int jme, int kms, int kme, 
                    int its, int ite, int jts, int jte, int kts, int kte, int myprcid);

// Function prototype for GPTL
int gptlinitialize();
int gptlstart(const char *name);
int gptlstop(const char *name);
int gptlpr_file(const char *filename);
int gptlsetoption(int option, int value);

// Define GPTL options
#define GPTLoverhead 1
#define GPTLdepthlimit 2
#define GPTLabort_on_error 3
#define GPTLmpiwtime 4

// Define the maximum number of iterations
#define ITER_MAX 10

// Fortran subroutine converted to C
void solve_helmholts(double a_helm[19][1000][1000], double b_helm[1000][1000][1000], 
                    double cm_helm[1000][1000][1000][8], double threshold, 
                    double pi[1000][1000][1000], int idep, int jdep, 
                    int ids, int ide, int jds, int jde, int kds, int kde, 
                    int ims, int ime, int jms, int jme, int kms, int kme, 
                    int its, int ite, int jts, int jte, int kts, int kte, int myprcid) {
    int ims, ime, jms, jme, kms, kme;
    int ids, ide, jds, jde, kds, kde;
    int its, ite, jts, jte, kts, kte;
    int idep, jdep;
    int int1, int2;
    int i, j, k, n, l, kk;
    int ibegin, iend, jbegin, jend;
    int myprcid;
    double d = 1.0;
    double ep = threshold;
    int iter_max = ITER_MAX;

    ibegin = its;
    iend = ite;
    jbegin = jts;
    jend = (int)min(jde - 1, jte);

    // Call the GCR solver
    psolve_gcr_main(ep, a_helm, b_helm, cm_helm, iter_max, pi, d, 
                   idep, jdep, ids, ide, jds, jde, kds, kde, 
                   ims, ime, jms, jme, kms, kme, 
                   its, ite, jts, jte, kts, kte, myprcid);

    // GPTL timing
#ifdef GPTL_TIMING
    int ret = gptlinitialize();
    ret = gptlstart("gcr_main");
    ret = gptlstop("gcr_main");
    ret = gptlpr_file("outfile_f90");
    ret = gptlfinalize();
#endif
}

// Dummy function for psolve_gcr_main (replace with actual implementation)
void psolve_gcr_main(double ep, double a_helm[19][1000][1000], double b_helm[1000][1000][1000], 
                    double cm_helm[1000][1000][1000][8], int iter_max, double pi[1000][1000][1000],
                    double d, int idep, int jdep, 
                    int ids, int ide, int jds, int jde, int kds, int kde, 
                    int ims, int ime, int jms, int jme, int kms, int kme, 
                    int its, int ite, int jts, int jte, int kts, int kte, int myprcid) {
    // Placeholder for the actual implementation
    // This function would perform the GCR solver
    // (replace with real code)
}